CN104283442B - A kind of current balance circuit with multiple-channel output - Google Patents
A kind of current balance circuit with multiple-channel output Download PDFInfo
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- CN104283442B CN104283442B CN201410538807.0A CN201410538807A CN104283442B CN 104283442 B CN104283442 B CN 104283442B CN 201410538807 A CN201410538807 A CN 201410538807A CN 104283442 B CN104283442 B CN 104283442B
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- rectification circuit
- vice
- side winding
- diode
- current balance
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/064—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode with several outputs
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/068—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode mounted on a transformer
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
Abstract
A kind of current balance circuit with multiple-channel output according to the present invention, corresponding two rectification circuits of same vice-side winding are flowed using the first equal fluid element, the electric current between different vice-side windings is flowed using the second equal fluid element, realize that the output current between multiple rectification circuits is balanced with this, without the need for any extra active device and control.This current balance circuit according to the present invention, it is adaptable to the situation of the multiple windings of secondary, the current balance type between multiple-channel output is realized by the self-characteristic of equal fluid element.Even in powerful application scenario, low pressure-resistant commutation diode and filter capacitor can also meet requirement, not only increase the conversion efficiency of whole system, volume and cost are also saved using the filter capacitor of low-capacitance, while circuit structure is simple, easily realize.Current balance circuit according to the present invention, it is adaptable to need the power supply occasion of multiple identical currents outputs, be particularly suitable for use in multiple-channel output LED driver.
Description
It is 15 days 02 month 2012 months the applying date that the application, which is, and Application No. 201210032720.7 is entitled " a kind of
The divisional application of current balance circuit with multiple-channel output ".
Technical field
The present invention relates to a kind of circuit with multiple-channel output, more particularly to a kind of current balance type electricity with multiple-channel output
Road.
Background technology
At present, LED is applied when needing the occasion of high power, highlight illumination, often multiple LED strips are applied in combination.
LED brightness is directly related with the forward current size that it flows through：In general, the forward current for flowing through LED is bigger, its brightness
To be bigger.In order to realize multiple LED luminance proportion, precise equalization is generally wanted to flow through the forward current of multiple LED strips.LLC is humorous
The DC converter that shakes has very high conversion efficiency, and the occasion of LED drivings, its theory diagram such as Fig. 1 institutes are widely used at present
Show, corresponding two commutating circuits of its vice-side winding pass through capacitance C1Reach current balance type, without any active
Element and Active control, but this can be only realized with individual current balance type between vice-side winding, two LED strips, when series connection
When LED numbers are excessive, LED strip terminal voltage is too high, by cause on rectifying device it is pressure-resistant increase, and the diode forward of high withstand voltage
Pressure drop is larger, and its conduction loss and reverse recovery loss be can not ignore, therefore causes the conversion efficiency of whole system to be difficult into one
Step optimization is improved.Further, since filter capacitor will select the big capacitance electric capacity of high pressure, design and production cost are added.
The current balance type between two LED strips, Application No. can only be realized for the scheme shown in Fig. 1
201110133497.0 patent of invention propose a kind of current balance circuit, its basic theory diagram is as shown in Fig. 2 wherein
First equal fluid element balances the electric current of first and second light-emitting diode component reception, and the second equal fluid element balances second and third
The electric current that light-emitting diode component is received.
The content of the invention
In view of this, it is an object of the invention to provide a kind of current balance circuit with multiple-channel output, it utilizes
One equal fluid element is flowed to corresponding two rectification circuits of same vice-side winding, using the second equal fluid element to different pairs
Electric current between the winding of side is flowed, and realizes that output current between multiple rectification circuits is balanced with this, without the need for appointing
What extra active device and control.
It is described according to a kind of current balance circuit with multiple-channel output of one embodiment of the invention, including a transformer
Transformer includes a primary side winding and at least two vice-side windings, wherein the primary side winding receives an AC input current；
The vice-side winding is to corresponding first rectification circuit and the supplying power for input end of the second rectification circuit；Described first is whole
The output end of current circuit and the second rectification circuit is the output end of the current balance circuit；
The vice-side winding is connected with the first equal fluid element；The first equal fluid element is to realize the same secondary
Electric current between corresponding first rectification circuit of winding and the second rectification circuit flows；
Corresponding second rectification circuit of the different vice-side windings passes sequentially through the second equal fluid element connection, described second
Electric current between the equal fluid element vice-side winding different to realize flows.
Further, the described first equal fluid element flows electric capacity including first.
Further, the described second equal fluid element flows electric capacity including second, its one end connect respectively logical two it is different
Corresponding second rectification circuit of the vice-side winding, the other end ground connection.
Further, first rectification circuit includes the first diode, the second diode, the first filter capacitor；It is described
First diode and the second diode are sequentially connected in series and are connected to the ground after in parallel with first filter capacitor；
The points of common connection of first diode and the second diode is the input of first rectification circuit；It is described
The two ends of first filter capacitor are the output end of first rectification circuit.
Further, second rectification circuit includes the 3rd diode, the 4th diode, the second filter capacitor；
3rd diode is sequentially connected in series with the 4th diode；The negative electrode and described second of 3rd diode
The first end connection of filter capacitor, the second end of second filter capacitor is connected as the first of second rectification circuit
End；The anode of 4th diode as second rectification circuit the second connection end；
The points of common connection of 3rd diode and the 4th diode is the input of second rectification circuit；It is described
The two ends of second filter capacitor are the output end of second rectification circuit；
Corresponding second rectification circuit of different vice-side windings passes through the first connection end and the second connection end successively phase
Even, its points of common connection is connected to the described second equal fluid element.
Preferably, the load of the multi-channel output connection of the current balance circuit is one or more hairs being connected in series
Optical diode.
According to the present invention current balance circuit, it is adaptable to the situation of the multiple windings of secondary, by equal fluid element itself
Characteristic realizes the current balance type between multiple-channel output.Even in powerful application scenario, low pressure-resistant commutation diode and filter
Ripple electric capacity can also meet requirement, not only increase the conversion efficiency of whole system, also be saved using the filter capacitor of low-capacitance
Volume and cost, while circuit structure is simple, are easily realized.Current balance circuit according to the present invention, it is adaptable to need many
The power supply occasion of individual identical currents output, be particularly suitable for use in multiple-channel output LED driver.
Brief description of the drawings
Fig. 1 show the theory diagram of the current balance circuit of two-way output in the prior art；
Fig. 2 show the theory diagram of the current balance circuit of multiple-channel output in the prior art；
Fig. 3 show the principle frame of the first embodiment of the current balance circuit with multiple-channel output according to the present invention
Figure；
Fig. 4 show the principle frame of the second embodiment of the current balance circuit with multiple-channel output according to the present invention
Figure；
Fig. 5 show the principle frame of the 3rd embodiment of the current balance circuit with multiple-channel output according to the present invention
Figure.
Embodiment
Several preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing, but the present invention is not restricted to
These embodiments.The present invention covers any replacement, modification, equivalent method and side made in the spirit and scope of the present invention
Case.Thoroughly understand in order that the public has to the present invention, be described in detail in present invention below preferred embodiment specific thin
Section, and description without these details can also understand the present invention completely for a person skilled in the art.
With reference to Fig. 3, the original of the first embodiment according to the current balance circuit with multiple-channel output of the invention is shown
Block diagram is managed, it includes a transformer, the transformer includes a primary side winding npWith two vice-side winding ns1、ns2。
The primary side winding npReceive an AC input current, the vice-side winding ns1To corresponding first rectification circuit
301 and second rectification circuit 302 supplying power for input end, the vice-side winding ns2To corresponding first rectification circuit 303 and second
The supplying power for input end of rectification circuit 304.The output end of first rectification circuit 301,303 and the second rectification circuit 302,304
Four tunnel output ends of respectively described current balance circuit；
The vice-side winding ns1It is connected with the first equal fluid element 305；The first equal fluid element 305 is described to realize
Vice-side winding ns1Electric current between the corresponding rectification circuit 302 of first rectification circuit 301 and second flows；Accordingly, the pair
Side winding ns2It is connected with the first equal fluid element 306；The first equal fluid element 306 is to realize the vice-side winding ns2It is right
Electric current between the first rectification circuit 303 and the second rectification circuit 304 answered flows；
The vice-side winding ns1、ns2Corresponding second rectification circuit 302,304 is connected by the second equal fluid element 307, institute
The second equal fluid element 307 is stated to realize the vice-side winding ns1、ns2Between electric current flow.
All output branch in current balance circuit can be realized by the effect of the first equal fluid element and the second equal fluid element
Current balance between road.The number for needing exist for vice-side winding in explanation, embodiment illustrated in fig. 3 can be 2 or 2
More than, its annexation can be analogized from Fig. 3 to be obtained.
With reference to Fig. 4, the original of the second embodiment according to the current balance circuit with multiple-channel output of the invention is shown
Block diagram is managed, the first equal fluid element in embodiment illustrated in fig. 3, the second equal fluid element, the first rectification circuit and second has been described in detail
The concrete methods of realizing and annexation of rectification circuit.
Wherein described first equal fluid element 305 includes the first stream electric capacity CB11, the second equal fluid element 307 includes the
Two stream electric capacity CB2。
First rectification circuit 301 includes the first diode D11, the second diode D21, the first filter capacitor Co11；Institute
State the first diode D11With the second diode D21Be sequentially connected in series and with the first filter capacitor Co11It is connected to after being connected in parallel
Ground；
The first diode D11With the second diode D21Points of common connection be first rectification circuit input
End；The first filter capacitor Co11Two ends be first rectification circuit output end.
Second rectification circuit 302 includes the 3rd diode D31, the 4th diode D41With the second filter capacitor Co12；
The 3rd diode D31With the 4th diode D41It is sequentially connected in series；The 3rd diode D31Negative electrode with
The second filter capacitor Co12First end connection, the second filter capacitor Co12The second end be used as second rectified current
The first connection end A1 on road；The anode of 4th diode as second rectification circuit the second connection end A2；
The 3rd diode D31With the 4th diode D41Points of common connection be second rectification circuit input
End；The second filter capacitor Co12Two ends be second rectification circuit output end.
The vice-side winding ns2The corresponding first equal fluid element 306, the first rectification circuit 303, the second rectification circuit
304 composition and annexation respectively with the vice-side winding ns1The corresponding first equal fluid element 305, the first rectified current
Road 301, the second rectification circuit 302 are identical.
First connection end A1 of second rectification circuit 302 and the second connection end B2 of second rectification circuit 304
It is grounded respectively.
Second connection end A2 of second rectification circuit 302 and the first connection end B1 of second rectification circuit 304
It is connected, its points of common connection is connected to the described second stream electric capacity CB2One end, the described second stream electric capacity CB2The other end
Ground connection.
Because electric capacity has ampere-second equilibrium response, therefore the first stream electric capacity and the second equal stream electric capacity is flowed through during stable state
Average current value is respectively zero, i.e., the average current value for forward flowing through the first stream electric capacity and the second stream electric capacity is respectively equal to
Inversely flow through its average current value, therefore the described first stream electric capacity can balance the corresponding two-way rectification of corresponding vice-side winding
Electric current between circuit, and the second stream electric capacity can balance the electric current between vice-side winding, and then realize the current balance type
Current balance type between the multiple-channel output of circuit.
Current balance circuit it can be seen from more than according to one embodiment of the invention, passes through itself spy of equal fluid element
Property realizes the current balance type between multiple-channel output.Even in powerful application scenario, low pressure-resistant commutation diode and filtering
Electric capacity can also meet requirement, not only increase the conversion efficiency of whole system, be also saved using the filter capacitor of low-capacitance
Volume and cost, while circuit structure is simple, are easily realized.
Annexation still by taking two vice-side windings as an example to the current balance circuit and work in embodiment illustrated in fig. 4
Principle is illustrated, in practice, and the current balance circuit according to the embodiment of the present invention can be expanded as multiple vice-side windings
Form, meanwhile, the annexation of vice-side winding and the corresponding first equal fluid element, the first rectification circuit and the second rectification circuit
Also the form shown in Fig. 3 and Fig. 4 is not limited to, the current balance type with multiple-channel output of the foundation present invention as shown in Figure 5 is electric
In the 3rd embodiment on road, vice-side winding is respectively ns1、ns2、...nsn, and from unlike Fig. 3 and embodiment illustrated in fig. 4,
Wherein vice-side winding ns1、ns2The first output end connection first flow electric capacity one end, shown first flow electric capacity the other end
Connect corresponding first rectification circuit or the second rectification circuit.And vice-side winding ns1First connection of corresponding second rectification circuit
Hold A1 and vice-side winding ns2Second connection end B2 of corresponding second rectification circuit is connected, and its points of common connection is connected to described
Second stream electric capacity CB21One end, the described second stream electric capacity CB21The other end ground connection, by that analogy, vice-side winding nsnCorrespondence
The second rectification circuit the connection of the second connection end M2 corresponding with adjacent vice-side winding the second rectification circuits after, its public company
Contact is connected to the described second stream electric capacity CB2(n-1)One end.It is corresponding with above annexation, vice-side winding ns1Correspondence
The second rectification circuit the second connection end A2 and vice-side winding nsnCorresponding the first connection end of second rectification circuit M1 difference
Ground connection.
In addition, the current balance circuit shown in Fig. 4 and embodiment illustrated in fig. 5, it is excellent that its each road exports connected load
Electing as in one or more light emitting diodes being connected in series, practical application can flow for each road output the need for any appropriate
Load.
According to embodiments of the invention as described above, these embodiments do not have all details of detailed descriptionthe, not yet
It is only described specific embodiment to limit the invention.Obviously, as described above, it can make many modifications and variations.This explanation
Book is chosen and specifically describes these embodiments, is in order to preferably explain the principle and practical application of the present invention, so that affiliated
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The present invention is only by right
The limitation of claim and its four corner and equivalent.
Claims (3)
1. a kind of current balance circuit with multiple-channel output, including a transformer, the transformer include a primary side winding and
At least two vice-side windings, wherein the primary side winding receives an AC input current, it is characterised in that：
The vice-side winding is to corresponding first rectification circuit and the supplying power for input end of the second rectification circuit；First rectified current
The output end of road and the second rectification circuit is the output end of the current balance circuit；
The vice-side winding is connected with the first equal fluid element；The first equal fluid element is to realize the same vice-side winding
Electric current between corresponding first rectification circuit and the second rectification circuit flows；
Corresponding second rectification circuit of the different vice-side windings passes sequentially through the second equal fluid element connection；
The first equal fluid element flows electric capacity including first；
The second equal fluid element flows electric capacity including second,
Second rectification circuit has the first connection end and the second connection end,
The load of the multi-channel output connection of the current balance circuit is one or more light emitting diodes being connected in series,
Corresponding second rectification circuit of the first vice-side winding and the corresponding load at least two vice-side winding
The connected one end of negative terminal is the first end of corresponding second rectification circuit of first vice-side winding, first vice-side winding pair
The first end for the second rectification circuit answered is connected with the first end of the described second stream electric capacity,
Corresponding second rectification circuit of the second vice-side winding and the corresponding load at least two vice-side winding
The connected one end of negative terminal is the first end of corresponding second rectification circuit of second vice-side winding, second vice-side winding pair
The first end for the second rectification circuit answered is connected with the second end of the described second stream electric capacity,
The second end ground connection of described second equal stream electric capacity, the second equal fluid element is to realize first vice-side winding and the
Electric current between two vice-side windings flows.
2. current balance circuit according to claim 1, it is characterised in that first rectification circuit includes the one or two pole
Pipe, the second diode, the first filter capacitor；First diode and the second diode are sequentially connected in series and filtered with described first
It is connected to the ground after electric capacity is in parallel；
The points of common connection of first diode and the second diode is the input of first rectification circuit；Described first
The two ends of filter capacitor are the output end of first rectification circuit.
3. current balance circuit according to claim 1, it is characterised in that second rectification circuit includes the three or two pole
Pipe, the 4th diode, the second filter capacitor；
3rd diode is sequentially connected in series with the 4th diode；The negative electrode of 3rd diode and the described second filtering
The first end connection of electric capacity, the second end of second filter capacitor as second rectification circuit the first connection end；Institute
The anode for stating the 4th diode is used as the second connection end of second rectification circuit；
The points of common connection of 3rd diode and the 4th diode is the input of second rectification circuit；Described second
The two ends of filter capacitor are the output end of second rectification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410538807.0A CN104283442B (en) | 2012-02-15 | 2012-02-15 | A kind of current balance circuit with multiple-channel output |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100327207A CN102570862A (en) | 2012-02-15 | 2012-02-15 | Current balancing circuit with multi-path output |
| CN201410538807.0A CN104283442B (en) | 2012-02-15 | 2012-02-15 | A kind of current balance circuit with multiple-channel output |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100327207A Division CN102570862A (en) | 2012-02-15 | 2012-02-15 | Current balancing circuit with multi-path output |
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| Publication Number | Publication Date |
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| CN104283442A CN104283442A (en) | 2015-01-14 |
| CN104283442B true CN104283442B (en) | 2017-08-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109195261B (en) * | 2018-10-08 | 2020-02-14 | 广东省崧盛电源技术有限公司 | Multi-output constant current driving circuit and driving power supply |
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| CN201821553U (en) * | 2010-09-19 | 2011-05-04 | 英飞特电子（杭州）有限公司 | Open-circuit protecting circuit of light emitting diode constant-current driving circuit |
| CN102186296A (en) * | 2011-05-20 | 2011-09-14 | 台达能源技术（上海）有限公司 | Current balancing circuit |
| CN202083974U (en) * | 2011-02-23 | 2011-12-21 | 英飞特电子（杭州）有限公司 | Load driving circuit |
| CN102316620A (en) * | 2010-07-09 | 2012-01-11 | 英飞特电子（杭州）有限公司 | Multi-path direct current power supply circuit |
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2012
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101278468A (en) * | 2005-10-03 | 2008-10-01 | 三垦电气株式会社 | Multi-output switching power supply device |
| CN1790887A (en) * | 2005-11-25 | 2006-06-21 | 浙江大学 | Insulated multipath output DC-DC converter |
| CN102316620A (en) * | 2010-07-09 | 2012-01-11 | 英飞特电子（杭州）有限公司 | Multi-path direct current power supply circuit |
| CN201821553U (en) * | 2010-09-19 | 2011-05-04 | 英飞特电子（杭州）有限公司 | Open-circuit protecting circuit of light emitting diode constant-current driving circuit |
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